All cells in the blastula are identical in structure and differ from each other only in the amount of yolk contained in them. Such cells that do not have signs of specialization and are not adapted to perform certain functions are called non-specialized. From different non-specialized cells, these or other organs and tissues may arise.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.